catch-key-X-up not working

Hi there,
(Using breve 2.3 IDE on Windows XP)
I get no response from the catch-key-X-up method.
E.g.

        + to catch-key-up-down:
            light set-velocity to (1,0,0).
            print "Key pressed.".
        + to catch-key-up-up:
            light set-velocity to (0,0,0).
            print "Key released.".

I get the results and printout from the down press, but no up event occurs.
I also get a repeating of the down event if I hold the key down, which is different from what is documented at:
http://www.spiderland.org/breve/breve_docs/docs/keyboard.html

How does anyone else go with this?
Am I missing a key-repeat setting, or ...?